Table 4. Open in new tab Spectral...

Name	Spectral	N_H,tot^a	N_H	kT	\|$R_{\rm BB,1\, kpc}$\|	F_X	m_R	\|$\chi ^2/\,$\|dof	nhp
J022141.5−735632	BB	1.4	0.4 ± 0.1	0.062 ± 0.004	\|$6.7_{-1.7}^{+2.5}$\|	\|$(4.0_{-1.0}^{+1.5})\times 10^{-13}$\|	\|$31.7_{-0.6}^{+0.7}$\|	23.10/16	0.111
J022141.5−735632	PL+BB	1.4	0.5 ± 0.2	0.056 ± 0.004	\|$10.8_{-3.3}^{+5.3}$\|	\|$(5.9_{-1.8}^{+2.9})\times 10^{-13}$\|	\|$30.8_{-0.8}^{+0.9}$\|	13.51/15	0.563
J022141.5−735632	BB+BB	1.4	0.8 ± 0.2	0.049 ± 0.004	\|$21.2_{-6.8}^{+12.7}$\|	\|$(1.0_{-0.4}^{+0.7})\times 10^{-12}$\|	\|$29.5_{-0.8}^{+1.0}$\|	9.08/15	0.873
J031722.7−663704	BB	0.6	1.2 ± 0.2	0.062 ± 0.003	\|$3.3_{-0.7}^{+1.0}$\|	\|$(9.6_{-2.2}^{+3.2})\times 10^{-14}$\|	\|$33.3_{-0.5}^{+0.6}$\|	112.41/76	0.004
J175437.8−294149^c	BB	3.9	\|$3.2_{-1.1}^{+1.4}$\|	0.10 ± 0.01	<4.6	\|$(1.1_{-0.5}^{+1.1})\times 10^{-13}$\|	>32.0	8.50/10	0.580
J180528.2−273158	BB	2.9	2.6 ± 0.5	0.24 ± 0.02	\|$0.19_{-0.04}^{+0.05}$\|	(1.1 ± 0.2) × 10⁻¹³	38.0 ± 0.5	15.62/17	0.551
J181844.3−120751	APEC	7.1	5.6 ± 0.7	0.30 ± 0.03	–	\|$(1.2_{-0.4}^{+0.8})\times 10^{-12}$\|	–	39.53/23	0.017
J220221.4+015330^d	PL+BB	0.4	0.5 ± 0.2	0.188 ± 0.009	\|$0.84_{-0.09}^{+0.12}$\|	(9.1 ± 0.8) × 10⁻¹³	–	49.41/40	0.146
J220221.4+015330^d	BB+BB	0.4	<0.3	0.16 ± 0.01	1.2 ± 0.2	(9.8 ± 1.1) × 10⁻¹³	–	43.89/40	0.310
J220221.4+015330^d	BREMSS	0.4	0.7 ± 0.1	0.53 ± 0.03	–	(2.3 ± 0.2) × 10⁻¹²	–	49.10/42	0.210

Name

Spectral

N_H,tot^a

N_H

|$R_{\rm BB,1\, kpc}$|

F_X

m_R

|$\chi ^2/\,$|dof

nhp

4XMM

model

(10²¹ cm⁻²⁾

(10²¹ cm⁻²)

(keV)

(km)

(erg s⁻¹ cm⁻²)

J022141.5−735632

1.4

0.4 ± 0.1

0.062 ± 0.004

|$6.7_{-1.7}^{+2.5}$|

|$(4.0_{-1.0}^{+1.5})\times 10^{-13}$|

|$31.7_{-0.6}^{+0.7}$|

23.10/16

0.111

J022141.5−735632

PL+BB

1.4

0.5 ± 0.2

0.056 ± 0.004

|$10.8_{-3.3}^{+5.3}$|

|$(5.9_{-1.8}^{+2.9})\times 10^{-13}$|

|$30.8_{-0.8}^{+0.9}$|

13.51/15

0.563

J022141.5−735632

BB+BB

1.4

0.8 ± 0.2

0.049 ± 0.004

|$21.2_{-6.8}^{+12.7}$|

|$(1.0_{-0.4}^{+0.7})\times 10^{-12}$|

|$29.5_{-0.8}^{+1.0}$|

9.08/15

0.873

J031722.7−663704

0.6

1.2 ± 0.2

0.062 ± 0.003

|$3.3_{-0.7}^{+1.0}$|

|$(9.6_{-2.2}^{+3.2})\times 10^{-14}$|

|$33.3_{-0.5}^{+0.6}$|

112.41/76

0.004

J175437.8−294149^c

3.9

|$3.2_{-1.1}^{+1.4}$|

0.10 ± 0.01

<4.6

|$(1.1_{-0.5}^{+1.1})\times 10^{-13}$|

>32.0

8.50/10

0.580

J180528.2−273158

2.9

2.6 ± 0.5

0.24 ± 0.02

|$0.19_{-0.04}^{+0.05}$|

(1.1 ± 0.2) × 10⁻¹³

38.0 ± 0.5

15.62/17

0.551

J181844.3−120751

APEC

7.1

5.6 ± 0.7

0.30 ± 0.03

–

|$(1.2_{-0.4}^{+0.8})\times 10^{-12}$|

–

39.53/23

0.017

J220221.4+015330^d

PL+BB

0.4

0.5 ± 0.2

0.188 ± 0.009

|$0.84_{-0.09}^{+0.12}$|

(9.1 ± 0.8) × 10⁻¹³

–

49.41/40

0.146

J220221.4+015330^d

BB+BB

0.4

<0.3

0.16 ± 0.01

1.2 ± 0.2

(9.8 ± 1.1) × 10⁻¹³

–

43.89/40

0.310

J220221.4+015330^d

BREMSS

0.4

0.7 ± 0.1

0.53 ± 0.03

–

(2.3 ± 0.2) × 10⁻¹²

–

49.10/42

0.210

Name	Spectral	N_H,tot^a	N_H	kT	\|$R_{\rm BB,1\, kpc}$\|	F_X	m_R	\|$\chi ^2/\,$\|dof	nhp
J022141.5−735632	BB	1.4	0.4 ± 0.1	0.062 ± 0.004	\|$6.7_{-1.7}^{+2.5}$\|	\|$(4.0_{-1.0}^{+1.5})\times 10^{-13}$\|	\|$31.7_{-0.6}^{+0.7}$\|	23.10/16	0.111
J022141.5−735632	PL+BB	1.4	0.5 ± 0.2	0.056 ± 0.004	\|$10.8_{-3.3}^{+5.3}$\|	\|$(5.9_{-1.8}^{+2.9})\times 10^{-13}$\|	\|$30.8_{-0.8}^{+0.9}$\|	13.51/15	0.563
J022141.5−735632	BB+BB	1.4	0.8 ± 0.2	0.049 ± 0.004	\|$21.2_{-6.8}^{+12.7}$\|	\|$(1.0_{-0.4}^{+0.7})\times 10^{-12}$\|	\|$29.5_{-0.8}^{+1.0}$\|	9.08/15	0.873
J031722.7−663704	BB	0.6	1.2 ± 0.2	0.062 ± 0.003	\|$3.3_{-0.7}^{+1.0}$\|	\|$(9.6_{-2.2}^{+3.2})\times 10^{-14}$\|	\|$33.3_{-0.5}^{+0.6}$\|	112.41/76	0.004
J175437.8−294149^c	BB	3.9	\|$3.2_{-1.1}^{+1.4}$\|	0.10 ± 0.01	<4.6	\|$(1.1_{-0.5}^{+1.1})\times 10^{-13}$\|	>32.0	8.50/10	0.580
J180528.2−273158	BB	2.9	2.6 ± 0.5	0.24 ± 0.02	\|$0.19_{-0.04}^{+0.05}$\|	(1.1 ± 0.2) × 10⁻¹³	38.0 ± 0.5	15.62/17	0.551
J181844.3−120751	APEC	7.1	5.6 ± 0.7	0.30 ± 0.03	–	\|$(1.2_{-0.4}^{+0.8})\times 10^{-12}$\|	–	39.53/23	0.017
J220221.4+015330^d	PL+BB	0.4	0.5 ± 0.2	0.188 ± 0.009	\|$0.84_{-0.09}^{+0.12}$\|	(9.1 ± 0.8) × 10⁻¹³	–	49.41/40	0.146
J220221.4+015330^d	BB+BB	0.4	<0.3	0.16 ± 0.01	1.2 ± 0.2	(9.8 ± 1.1) × 10⁻¹³	–	43.89/40	0.310
J220221.4+015330^d	BREMSS	0.4	0.7 ± 0.1	0.53 ± 0.03	–	(2.3 ± 0.2) × 10⁻¹²	–	49.10/42	0.210

Table 4.

Open in new tab

Spectral properties of the six unknown sources.

Name	Spectral	N_H,tot^a	N_H	kT	\|$R_{\rm BB,1\, kpc}$\|	F_X	m_R	\|$\chi ^2/\,$\|dof	nhp
4XMM	model	(10²¹ cm⁻²⁾	(10²¹ cm⁻²)	(keV)	(km)	(erg s⁻¹ cm⁻²)	^b
J022141.5−735632	BB	1.4	0.4 ± 0.1	0.062 ± 0.004	\|$6.7_{-1.7}^{+2.5}$\|	\|$(4.0_{-1.0}^{+1.5})\times 10^{-13}$\|	\|$31.7_{-0.6}^{+0.7}$\|	23.10/16	0.111
J022141.5−735632	PL+BB	1.4	0.5 ± 0.2	0.056 ± 0.004	\|$10.8_{-3.3}^{+5.3}$\|	\|$(5.9_{-1.8}^{+2.9})\times 10^{-13}$\|	\|$30.8_{-0.8}^{+0.9}$\|	13.51/15	0.563
J022141.5−735632	BB+BB	1.4	0.8 ± 0.2	0.049 ± 0.004	\|$21.2_{-6.8}^{+12.7}$\|	\|$(1.0_{-0.4}^{+0.7})\times 10^{-12}$\|	\|$29.5_{-0.8}^{+1.0}$\|	9.08/15	0.873
J031722.7−663704	BB	0.6	1.2 ± 0.2	0.062 ± 0.003	\|$3.3_{-0.7}^{+1.0}$\|	\|$(9.6_{-2.2}^{+3.2})\times 10^{-14}$\|	\|$33.3_{-0.5}^{+0.6}$\|	112.41/76	0.004
J175437.8−294149^c	BB	3.9	\|$3.2_{-1.1}^{+1.4}$\|	0.10 ± 0.01	<4.6	\|$(1.1_{-0.5}^{+1.1})\times 10^{-13}$\|	>32.0	8.50/10	0.580
J180528.2−273158	BB	2.9	2.6 ± 0.5	0.24 ± 0.02	\|$0.19_{-0.04}^{+0.05}$\|	(1.1 ± 0.2) × 10⁻¹³	38.0 ± 0.5	15.62/17	0.551
J181844.3−120751	APEC	7.1	5.6 ± 0.7	0.30 ± 0.03	–	\|$(1.2_{-0.4}^{+0.8})\times 10^{-12}$\|	–	39.53/23	0.017
J220221.4+015330^d	PL+BB	0.4	0.5 ± 0.2	0.188 ± 0.009	\|$0.84_{-0.09}^{+0.12}$\|	(9.1 ± 0.8) × 10⁻¹³	–	49.41/40	0.146
J220221.4+015330^d	BB+BB	0.4	<0.3	0.16 ± 0.01	1.2 ± 0.2	(9.8 ± 1.1) × 10⁻¹³	–	43.89/40	0.310
J220221.4+015330^d	BREMSS	0.4	0.7 ± 0.1	0.53 ± 0.03	–	(2.3 ± 0.2) × 10⁻¹²	–	49.10/42	0.210

Name	Spectral	N_H,tot^a	N_H	kT	\|$R_{\rm BB,1\, kpc}$\|	F_X	m_R	\|$\chi ^2/\,$\|dof	nhp
4XMM	model	(10²¹ cm⁻²⁾	(10²¹ cm⁻²)	(keV)	(km)	(erg s⁻¹ cm⁻²)	^b
J022141.5−735632	BB	1.4	0.4 ± 0.1	0.062 ± 0.004	\|$6.7_{-1.7}^{+2.5}$\|	\|$(4.0_{-1.0}^{+1.5})\times 10^{-13}$\|	\|$31.7_{-0.6}^{+0.7}$\|	23.10/16	0.111
J022141.5−735632	PL+BB	1.4	0.5 ± 0.2	0.056 ± 0.004	\|$10.8_{-3.3}^{+5.3}$\|	\|$(5.9_{-1.8}^{+2.9})\times 10^{-13}$\|	\|$30.8_{-0.8}^{+0.9}$\|	13.51/15	0.563
J022141.5−735632	BB+BB	1.4	0.8 ± 0.2	0.049 ± 0.004	\|$21.2_{-6.8}^{+12.7}$\|	\|$(1.0_{-0.4}^{+0.7})\times 10^{-12}$\|	\|$29.5_{-0.8}^{+1.0}$\|	9.08/15	0.873
J031722.7−663704	BB	0.6	1.2 ± 0.2	0.062 ± 0.003	\|$3.3_{-0.7}^{+1.0}$\|	\|$(9.6_{-2.2}^{+3.2})\times 10^{-14}$\|	\|$33.3_{-0.5}^{+0.6}$\|	112.41/76	0.004
J175437.8−294149^c	BB	3.9	\|$3.2_{-1.1}^{+1.4}$\|	0.10 ± 0.01	<4.6	\|$(1.1_{-0.5}^{+1.1})\times 10^{-13}$\|	>32.0	8.50/10	0.580
J180528.2−273158	BB	2.9	2.6 ± 0.5	0.24 ± 0.02	\|$0.19_{-0.04}^{+0.05}$\|	(1.1 ± 0.2) × 10⁻¹³	38.0 ± 0.5	15.62/17	0.551
J181844.3−120751	APEC	7.1	5.6 ± 0.7	0.30 ± 0.03	–	\|$(1.2_{-0.4}^{+0.8})\times 10^{-12}$\|	–	39.53/23	0.017
J220221.4+015330^d	PL+BB	0.4	0.5 ± 0.2	0.188 ± 0.009	\|$0.84_{-0.09}^{+0.12}$\|	(9.1 ± 0.8) × 10⁻¹³	–	49.41/40	0.146
J220221.4+015330^d	BB+BB	0.4	<0.3	0.16 ± 0.01	1.2 ± 0.2	(9.8 ± 1.1) × 10⁻¹³	–	43.89/40	0.310
J220221.4+015330^d	BREMSS	0.4	0.7 ± 0.1	0.53 ± 0.03	–	(2.3 ± 0.2) × 10⁻¹²	–	49.10/42	0.210

Best-fitting parameters of the EPIC-pn spectra of the listed sources. Errors at 1σ . The fluxes, corrected for the absorption, are evaluated between 0.2 and 2 keV. ^aTotal H i column density for the source position according to the sky map of HI4PI Collaboration et al. (2016). ^bComputed extrapolating at optical wavelengths (λ = 700 nm) the best-fitting X-ray blackbody. ^cA Chandra ACIS-I spectrum is jointly fitted. ^dA Chandra ACIS-S and a Swift-XRT spectra are jointly fitted. Given that the source flux is variable, we reported only the ones measured by the XMM–Newton detection.

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